Gas-tight packing box



H. G. KITTREDGE ET AL GAS-TIGHT PACKING BOX June 21,1938. y 2,121,667

s sheets-sheet 1 Filed Aug. 19, 1935 /4 as L 29 A1"roRNFYs,4

June 21, 1938. H. G. KITTREDGE ET Ax.

GAS-TIGHT PACKING BOX June 21, 1938. Y H. G. KITTREDGE E'r Al. 2,121,667

GAS-TIGHT PACKING BOX INVENTORS HARVEY @.K/TTQEDQE mvp SYLVESTEE J. EEOPEE/CK.

ATTORNEYS Patented June 2 1, 1938 Y L Gasffrrogn'r raoxirrc'nox Harvey c. maison. Dayton.' and sylvester J. Broderick,`Yellow Springs,"fhio, assignors to Foiliilm, Inc., 'Dayton, Ultima corporation Application August 19, 1 9s5, s eal N9. 36,753

8 Claims. This invention relates to gas-tight containers. It is the object to provide containers that are impervious to moisture, the entrance of gases, and which will be heat and light reecting and impervious to the entrance of bacteria, vermin,

and the like.

Likewise, it is an object to similarly prevent the exit of gas, moisture, etc., from the interior of the container thus formed.

is light in weight, that is extremely cheap to manufacture, that can be produced in quantity, that can bemanufactured in fiat condition and shipped in flat condition and assembled by the user. and which can be sealed by the user in a simple manner without tools or special machinery. y Itis our object to eliminate the necessity for fusing and welding to form a gas-tight container. 20' It is our object to provide such container in the form of a sack, box, bottle, or any ci the standard forms. It is our particular object to be able to ma 'the container out of such extremely cheap materials as paper, pasteboard and boxboard, and to so seal the container'that when it is desired to open it it can be opened by disrupting the seal but without completely destroying the container, so thatit may still serve as a support for the contents until the contents ar'e used.

30 It is an object to provide a foldingl or collapsible container such as the ordinary box blank or l.

bag blank, to apply thereto permanently by an impervious adhesive coating a structurally weak metal i'llm such as metal foil-arranged in thickness from .00025 to^.001. This foil is-applied permanently to what will become the'interior of the box, -although it can likewise 'be appliedto the exterior, if it is not desired that the contents of the box engage the foil. Standing byitself'the foil is too delicate andlacks structural strength to be formed as a container. It is our object to thus line the blank of a foldingbox leaving .portions of the box notengaged by thefoil, so that the box can be folded with a continuousinner' 4 sheet of foil that extendsthroughout the `bottom andA side Walls as a continuous sheetand beneath the top and along the' top fiap.-

It is anobjec't; toifprovide a' portion of the box side walls with laterally-extending turnedover ledges to form upper sealing surfaces for engagement by the box cover, which is either hinged to the box or is lslidably mounted thereover. f It is an object to provide .a sealing medium for sealing the engaging surfaces of thetop and the side walls of the box to form' a gas-tight container. The resulting product is a 'foil-lined box' that is completely sealed.

It is an object to provide material that will It is an object to provide such a container that caus the metal to adhere to it and to-the container. and to provide material that can be applied at room temperature in any desired manner to the engaging surfaces of the top and bottom of the box to form a seal that will be strong, yielding and impervious to the entrance or exit of gas, moisture, etc., thus enabling the ordinary user to assemble a at box or other container and to seal it by squeezing the ,material from a tube, applying with a brush, a roller or the like.

It is an object to provide such a material that will withstand the expansion and contraction to which it will be subjected..

It is a further object to provide a strong sealing adhesive which can be applied hot and which upon cooling will strongly adhere to either the box or the metal or both.

Referring to the drawings:

Figure 1 is a perspective of a container with the bottom and side walls in section and the top thereof in section, showing ya type where the seal between the box cover and the box side walls is on the outside of the'upper edge ofthe box walls.

Figure 2 is asection on line 2-2 of Figure 1.

Figure 3 is a similar view to Figure 1, showing a type with an inwardlyturned ledge on the box.

Figure 4 is asectionon the line 4- 4 of Figure 3'. Figure 5 is a plan viewof agfoldingA box blank vbefore the application .of the foil. thereto. `Figure-6 is a perspective of ,'theclosed folded box. .l ,v

Figure 7 is a perspective of. a-boxv opened with the foil strips notyet foldedback over the paper ledges -for sealing purposes.A Thistypeiof box is one in .which the'foilisapplied after thebox is assembled, there being one strip of foil running in one direction, and another strip offoil running invanother direction; the edges thereof overlappingand sealedto one another. 1

Figure 8 is a section .on the line 8 8 through a corner of the box shown in Figure 7.-

- `Figure 9 isa .section on the line ST9 through a side wall of the box. Figure 10"is' a section on "Figure 11 is alsection on'the lix 1el'l""|'l` of Figure 7. f "-l' Figure 12 is a perspective of a paper sack having rapplied thereto an inner sack of foil which has been permanently anchored thereto.

Figure 13 is a section Vthrough v the mouth of the bag afterit hasbeen turnedwover and the sealing medium applied thereto.

Figure 14 is a section through themouth of the bag after the sealing medium has been `turned over by further folding of the mouth ofhthe bag for final sealing of the bag.

Figure 15 is a top plan view of the linev `ilI--Ill of a folding box blankwith the foil applied thereto on the inside thereof.

Figure- 16 is a plan view of the outside of the box blank after the foil has been applied to the `insideand partially on the outside.

tHe-corner of the box shown in Figure 17.

Figure 21 is a section on the line 2|-2I of Figure 15.

Figure 22 is a section on the line 22-22 of Figure 15.

Referring to the. drawings in detail, we prefer to use aluminum foil, but any desired metallicfoil may be employed that comprises a very thin, structurally weak metallicfoil that is impervious. This foil Iis preferably applied as follows: One side of the foil is coated with 20 grams of vinyl acetate, 2.5y grams of tricresyl phosphate, and 20 cc. of toluol. This material is applied to metal at room temperature and preferably permitted to dry until tacky in a current of air at about 212 F. for about five minutes. These temperatures and times will depend upon the amount of solvent used, the speed of the air current, etc.

While thefoil has one side of the adhesive tacky the paper and foil rare pressed together. If desired the adhesive material can be applied on the paper or pasteboard of the box or container. The foil then can be applied to the 4adhesive surface of the 'paper vor pasteboard by the application of pressure. The adhesive can be applied to either the' foil or the paper or .pasteboard by spreading. spraying, by rolls or the like.

It is to be understood that one of the primary problemsv has been the development of an adhesive that is impervious to moisture, that is not moisture-absorbent, that is markedly adhesive, that will not penetrate and stain the pasteboard or paper, and that is very adherent to materials that are extremely hard and smooth, such as aluminum foil.

After the container has been thus made it is necessary to seal the metal-to-metal or metal and pasteboard or paper surfaces with a sealing vmedium that is suillcientlystrong and resilient to lie-satisfactory, that" isi-gas-tight, and .that canb'e applied at ordinary room` temperatures and will adhere with very slight pressure, in view of the fact that in many forms of containers it will not be possible to apply a material amount of pressure in sealing. Where the first-mentioned type of adhesive material cannot be employed, then the following sealing, compound has been found satisfactory. We employ 25% of a viscous adhesive chlorinated diphenyl, of a solid chlorinated diphenyl and 25% of paracoumarone resin. These several materials are mixed together at 100 C. and thoroughly stirred and applied hot l by a brush or other means. 'I'he viscosity of the sealing compound is controlled by controlling the temperature.

This adhesive is the subject of a co-pending application of Harvey G. Kittredge and Sylvester J. Broderick, Serial No. 37,210, illed August 21, 1935, which has now matured into Letters Patent No. 2,096,110, dated October 19, 1937, and the subject matter thereof is reserved for said ter thereof is reserved to be covered thereby.

.bottom and 2 the side walls of a box.

are sealed to one another.

application. The material used for applying the foil is the subject of an application of Harvey G. Kittredge and Sylvester J. Broderick, Ser. No. 7070, of February 18, 1935, and the subject mataeferrlng to the drawings m detail, and pasticularly the box shown in Fig. 1, I designates the 3 designates the attaching material for the foil sheet 4.

the sealing medium 1 heretofore described.v While this is still hot and plastic or viscous, the cover,

.thebox as at 5 and 6. .Upon the outside. of the foil l is applied, when the box is to be sealed,

having a top 8 and side walls 9 is applied, and

slight pressure applied to the cover over the area 1. If desired, the sealing medium 1 may b'e carried on top of the foil strip l.

In Figs. 3 and 4 the box side walls have their upper edges turned over and inwardly as at I0, to form a supporting ledge upon which the foil strip 4 rests and to which it adheres by the adhesive I I. On top of this ledge thus formed there is applied the sealing medium I2 and then the cover 8 of the box is brought in'to position, slight pressure applied, and the seal is accomplished.

Referring to the folding box, there are two methods by which the foil is applie'i to a folding box. The ilrst method is to assemble the box blank in the usual manner and then line the folded box either with a continuous sheet of foil after the adhesive has been supplied thereto, or by a plurality of strips that overlap one another and I 'Ihe second general method is to apply to the unfolded box blank a sheet of foil to those portions to which it is to permanently adhere on both the inside and outside of the blank., and to then fold the box and the surplus foil by allowing certain portions of the Vthat is rst folded and assembled into a container and then has the' foilv applied toit, we refer to Figs. 5, 6, 7, 8, 9, l0 and l1. The box blank shown inFig. 5 consists of a front'wall I3, a bottom Il, -a..rear wall. I5, a-.top il and a topsealing flap l1. i

The parts so mentioned are formed -from a single sheet of vstock and are hinged to one another along thew score lines Il, il, 2l, and 2i. The front wall I3 has hinged on either side thereof on the hinge line 22 end wall locking flaps 2 3, having locking slots 2l. The' bottom has hinged thereto end walls 25 hinged along the score lines 20. The back wall has hinged thereto along the score line 21 the locking ilap 28 which has a. hinged sealing ilap 2i hinged thereto along the score line 3l. The assembled box is shown in Fig. 6.

'I'his assembled box before the cover is closed has either a 'single strip of foil with its tacky adhesive backing applied on the interior of the box, or preferably a-strip designated 3| is `first applied to the bottom I4 and end walls V25. A transversely-arranged strip 32 is then applied to the inside of the front wall Il, the metal strip 3i on the bottom I4, the back l5, the inside of the top I6, the inside of the sealing strip I1 and is then turned over and applied to the outside of the sealing strip II. In the meantime, the strip 3| has been turned over on the outside of the sealing flaps 29. In Fig. 7 these turned-over strips of the foil have not been turned over,'for purpose of illustration, upon the sealing strips' Il and 29. When this is accomplished, then the sealing medium is applied to the outside of the flap I1 as at Ila, and to the outside of the sealing aps 29, as at 29-a, and the box is thus closed and sealed.

Referring to Figs. 15 to 20, in this form in which the foil is rst applied to the flat unfolded blank, the foil is adhesively applied to the inside of the front wall I3, the bottom I4, the end walls 25, the inside and outside of the sealing aps 29, the back wall I5, theinside of the top IS, the inside and outside of the sealing flap I'I. It overlaps but is not adhesively applied to the locking aps 23 and 28. The box is then folded in the usual manner and the surplus portion of the sheet of foil is folded at the corners. Due

to the fact that the adhesive material has the ability of rendering this structurally weak foil structurally strong, the foil will not tear even though bent and folded at the corners and even though not supported by the box blank. Thev outstanding characteristics of this medium used to coat this foil is the fact that it can convert a structurally weak metallic foil, that is so delicate as to necessitate extreme care in handling,

into a. material that has very marked structural strength.

Upon assembling the box, it is then loaded with its contents and by the application of the sealing medium to the outside of the flaps I1 and 29 the box is sealed.

Referring to the alternative -form shown in the bag type in Figs. 12 to 14, the same procedure is followed. Either a foil bag with an outer coating of adhesive is applied to the paper bag on the inside thereof, or the paper bag is applied to the inside of the foil bag; or the bag blank has the foil applied thereto and is then assembled in the usual manner, using the ad? hesive for assembly purposes. The bag is designated 33. The foil liner or foil bag is designated 34, andthe intermediate adhesive is designated 35. The mouth of the bag, when it is to be sealed, is folded over as in Fig. 13, has a sealing medium 36 applied thereto and then again folded over as in Fig. 14 and pressure is applied.

It will be understood that we desire to comprehend within our invention such modifications as may be necessaryto' adapt it to varying conditions and uses.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent, is:

1. In a method of making a gas-tight container, forming a paper container, applying a metal foil to the walls of said container and interposing anvadhesive between said foil and said container to render the foil structurally strong and permanently anchor it to the Walls of the container, applying a sealing medium to a portion of the container and bringing a cover for the container into engagement therewith.

2. In a method of forming a gas-tight container, forming a paper-container, adhesively applying a foil lm that is structurally weak tothe interior of the bottom and the top of the container while separate from one another, whereby the structurally weak foil is made structurally to engaging portions of the blank when the con-v tainer formed thereby is closed, and closing the container.

4. In a method of manufacturing a container, forming a box blank having a folded bottom, locking portions and a hinged top, said locking portions having sealing flaps for the bottom, and said top having a sealing ap on the top; applying an adhesive` to a metal foil to structurally strengthen it and render it adhesive; applying said adhesive to the interiorr of said box blank while unfolded, consisting of applying it to all parts of the interior of the blank except the locking flaps and to both the interior and exterior of the sealing flaps, on the locking aps 'and on the cover; and folding the box and utilizing the locking aps to retain the'box in folded position with an interior continuous lining of metal foil.

5. A new article of manufacture for use as a container comprising a top member and a bottom member formed of paper and adapted to form a container and a covering of structurally weak.

metal foil attached` to the members by an adhesive, adherent to both metal and paper and a tainer and adhere thereto.

6. In combination, in a container, a box bottom having a marginal ange, a lining of metal foil adhesively and permanently connected to the interior of said box bottom and overlapping upon the top of said ange and an adhesive on the tor.

' of 'said flange and a cover adapted toengage with said adhesive to seal the box.

7. -In combination, in a container, of a box bottom, an interior coating of adhesive extending over the top and along the outsidel margins of the box bottom, a layer .of foil over the adhesive per--l manently attached to the box bottom and extending over the top of 'the bottom partially down the outside walls thereof, a layer of adhesive on the outside of the metal foil on the outside of the box walls; and a cover having a top and sidewalls adapted to engage with said outside adhesive to seal said box.

8. In a box, a blank comprising-bottom, walls and top with a sealing fiap and locking aps a part of which have sealing flaps, a structurally weak metal foil film having a reinforcing adhesive backing so arranged that said film is applied to the interior of said blank :with the exception of the locking aps, which it overlaps, but is not attached to, said lm being attached to both inside'and outside of the sealing flaps on the locking iiaps and the cover.

HARVEY G. KM'I'REDG. SYLVESTER, J. BRODERICK.

'second adhesive adapted to seal engaging surfaces of the top and bottom members of the con- 

